20545644 has 48 divisors (see below), whose sum is σ = 55048448. Its totient is φ = 5842368.

The previous prime is 20545607. The next prime is 20545663. The reversal of 20545644 is 44654502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22827 + ... + 23709.

Almost surely, 2^20545644 is an apocalyptic number.

It is an amenable number.

20545644 is an abundant number, since it is smaller than the sum of its proper divisors (34502804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20545644 is a wasteful number, since it uses less digits than its factorization.

20545644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 20545644 is about 4532.7303030293. The cubic root of 20545644 is about 273.8881565304. Note that the first 3 decimals are identical.

The spelling of 20545644 in words is "twenty million, five hundred forty-five thousand, six hundred forty-four".